Question 1

Near the top of a mountain,water in an open pot boils at

Accepted Answer

A) a higher temperature than at sea level. 
B) a lower temperature than at sea level. 
C) the same temperature as at sea level. 
D) None of the above choices are true. 
A) a higher temperature than at sea level. 
B) a lower temperature than at sea level. 
C) the same temperature as at sea level. 
D) None of the above choices are true. B

Question 2

Stored potatoes,beets,and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero)because

Accepted Answer

A) they are good radiators of energy. 
B) they are good absorbers of radiant energy. 
C) the water in them contains dissolved salts and sugars. 
D) they are very dense. 
E) All of the above choices are true. 
A) they are good radiators of energy. 
B) they are good absorbers of radiant energy. 
C) the water in them contains dissolved salts and sugars. 
D) they are very dense. 
E) All of the above choices are true. C

Question 3

When liquids change to a solid state,they

Accepted Answer

A) absorb energy. 
B) release energy. 
C) neither absorb nor release energy. 
D) both absorb and release energy. 
A) absorb energy. 
B) release energy. 
C) neither absorb nor release energy. 
D) both absorb and release energy. B

Question 4

The calories needed to change 10 grams of ice at zero degrees C to steam at 100 degrees C is

Accepted Answer

A) 6200. 
B) 6400. 
C) 7200. 
D) 8000. 
E) None of the above choices are correct. 
A) 6200. 
B) 6400. 
C) 7200. 
D) 8000. 
E) None of the above choices are correct.

Question 5

Hot water has a relatively high rate of

Accepted Answer

A) evaporation. 
B) condensation. 
C) conductivity. 
D) convection. 
A) evaporation. 
B) condensation. 
C) conductivity. 
D) convection.

Question 6

The minimum amount of 100-degree-C steam needed to melt 1 gram of 0-degree-Celsius ice is

Accepted Answer

A) 0)125 gram. 
B) 0)148 gram. 
C) 6)75 grams. 
D) 8 grams. 
E) none of these 
A) 0)125 gram. 
B) 0)148 gram. 
C) 6)75 grams. 
D) 8 grams. 
E) none of these

Question 7

Which involves the larger number of calories?

Accepted Answer

A) the condensation of 1 gram of steam at 100 degrees Celsius to water at 100 degrees 
B) the cooling of 1 gram of water at 100 degrees Celsius to 1 gram of ice at absolute zero 
C) Both involve the same number of calories. 
D) Neither involves calories. 
A) the condensation of 1 gram of steam at 100 degrees Celsius to water at 100 degrees 
B) the cooling of 1 gram of water at 100 degrees Celsius to 1 gram of ice at absolute zero 
C) Both involve the same number of calories. 
D) Neither involves calories.

Question 8

Use the following figure to answer the question:  
-The phenomenon of regelation depends on the

Accepted Answer

A) freezing point of water. 
B) melting point of water. 
C) open-structured nature of ice crystals. 
D) high specific heat of water. 
A) freezing point of water. 
B) melting point of water. 
C) open-structured nature of ice crystals. 
D) high specific heat of water.

Question 9

The molecules in a room-temperature glass of water jostle around at

Accepted Answer

A) a great variety of speeds. 
B) much the same rates of speed. 
C) a very small range of speeds. 
A) a great variety of speeds. 
B) much the same rates of speed. 
C) a very small range of speeds.

Question 10

To melt 50 grams of 0-degree-Celsius ice requires

Accepted Answer

A) 25 calories. 
B) 50 calories. 
C) 80 calories. 
D) none of these 
A) 25 calories. 
B) 50 calories. 
C) 80 calories. 
D) none of these

Question 11

Firefighters find that the temperature of burning material is best lowered when water is

Accepted Answer

A) used in small amounts. 
B) pointed away from the flames. 
C) sprayed as a fine mist. 
D) salted. 
A) used in small amounts. 
B) pointed away from the flames. 
C) sprayed as a fine mist. 
D) salted.

Question 12

Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by

Accepted Answer

A) conduction. 
B) condensation. 
C) evaporation. 
D) melting. 
A) conduction. 
B) condensation. 
C) evaporation. 
D) melting.

Question 13

Steam burns are more damaging than burns caused by boiling water because steam

Accepted Answer

A) gives up additional energy when it condenses. 
B) has more energy per kilogram than boiling water. 
C) Choices A and B are both correct. 
D) Choices B and C are both incorrect. 
A) gives up additional energy when it condenses. 
B) has more energy per kilogram than boiling water. 
C) Choices A and B are both correct. 
D) Choices B and C are both incorrect.

Question 14

When a solid is changed to a liquid state,the solid

Accepted Answer

A) releases energy. 
B) absorbs energy. 
C) neither releases nor absorbs energy. 
D) both releases and absorbs energy. 
A) releases energy. 
B) absorbs energy. 
C) neither releases nor absorbs energy. 
D) both releases and absorbs energy.

Question 15

Boiling water does not increase in temperature when additional heat is applied because

Accepted Answer

A) the temperature doesn't change in a Change of Phase. 
B) added input energy doesn't increase the water's internal energy. 
C) the increased heating produces increased boiling,and therefore increased cooling. 
D) none of these 
A) the temperature doesn't change in a Change of Phase. 
B) added input energy doesn't increase the water's internal energy. 
C) the increased heating produces increased boiling,and therefore increased cooling. 
D) none of these

Question 16

Stored potatoes,beets,and rutabagas in a well-insulated but unheated room can be protected from freezing by having in the room

Accepted Answer

A) large blocks of foam plastic. 
B) large tubs of water. 
C) large rocks. 
D) large blocks of salt. 
E) large cubes of sugar. 
A) large blocks of foam plastic. 
B) large tubs of water. 
C) large rocks. 
D) large blocks of salt. 
E) large cubes of sugar.

Question 17

If you want to cook eggs by boiling them while in the mountains,then compared to sea-level cooking,you should

Accepted Answer

A) use a hotter flame. 
B) boil the eggs for a shorter time. 
C) boil the eggs for a longer time. 
D) None of the above choices are true. 
A) use a hotter flame. 
B) boil the eggs for a shorter time. 
C) boil the eggs for a longer time. 
D) None of the above choices are true.

Question 18

Melting snow

Accepted Answer

A) warms the surrounding air. 
B) cools the surrounding air. 
C) neither warms nor cools the surrounding air. 
A) warms the surrounding air. 
B) cools the surrounding air. 
C) neither warms nor cools the surrounding air.

Question 19

To turn ice at zero degrees Celsius to water at zero degrees Celsius,we must add

Accepted Answer

A) temperature. 
B) energy. 
C) force. 
D) time. 
E) It can't be done - water is always warmer than that. 
A) temperature. 
B) energy. 
C) force. 
D) time. 
E) It can't be done - water is always warmer than that.

Question 20

Evaporation is a cooling process and condensation is

Accepted Answer

A) a warming process. 
B) a cooling process also. 
C) neither a warming nor cooling process. 
A) a warming process. 
B) a cooling process also. 
C) neither a warming nor cooling process.

Exam 17: Change of Phase

Near the top of a mountain,water in an open pot boils at

Stored potatoes,beets,and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero)because

When liquids change to a solid state,they

The calories needed to change 10 grams of ice at zero degrees C to steam at 100 degrees C is

Hot water has a relatively high rate of

The minimum amount of 100-degree-C steam needed to melt 1 gram of 0-degree-Celsius ice is

Which involves the larger number of calories?

Use the following figure to answer the question: -The phenomenon of regelation depends on the

The molecules in a room-temperature glass of water jostle around at

To melt 50 grams of 0-degree-Celsius ice requires

Firefighters find that the temperature of burning material is best lowered when water is

Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by

Steam burns are more damaging than burns caused by boiling water because steam

When a solid is changed to a liquid state,the solid

Boiling water does not increase in temperature when additional heat is applied because

Stored potatoes,beets,and rutabagas in a well-insulated but unheated room can be protected from freezing by having in the room

If you want to cook eggs by boiling them while in the mountains,then compared to sea-level cooking,you should

Melting snow

To turn ice at zero degrees Celsius to water at zero degrees Celsius,we must add

Evaporation is a cooling process and condensation is

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